A newborn is literally a baby animal (including us human animals) who was born in the past month. Figuratively, newborn describes anything recently born or created, like a newborn interest in vocabulary.

Little babies are newborns until they're a month old — four weeks is the official human newborn cut-off age. Then they’re just regular ol’ babies. Other things can be newborn as long as they’re brand new — a newborn restaurant was opened recently, a newborn celebrity might be 18 but she just got famous. You could have a newborn fear if you recently became scared of something. Most newborns are not scary, though. (Unless you’re babysitting one.)

Definitions of newborn
  1. adjective
    recently born
    “a newborn infant”
    immature, young
    (used of living things especially persons) in an early period of life or development or growth
  2. adjective
    having just or recently arisen or come into existence
    “with newborn fears”
    synonyms: new-sprung
    not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered
  3. noun
    a baby from birth to four weeks
    synonyms: neonate, newborn baby, newborn infant
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    liveborn infant
    infant who shows signs of life after birth
    low-birth-weight baby, low-birth-weight infant
    an infant born weighing less than 5.5 pounds (2500 grams) regardless of gestational age
    postmature infant
    infant born after 42 weeks of gestation; usually shows signs of placental insufficiency
    preemie, premature baby, premature infant, premie, preterm baby, preterm infant
    an infant that is born prior to 37 weeks of gestation
    SGA infant, small-for-gestational-age infant
    an infant whose size and weight are considerably less than the average for babies of the same age
    stillborn infant
    infant who shows no signs of life after birth
    term infant
    infant born at a gestational age between 37 and 42 completed weeks
    type of:
    babe, baby, infant
    a very young child (birth to 1 year) who has not yet begun to walk or talk
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